Cognitive radio sensing method and system
a radio sensing and cognition technology, applied in the field of radio systems, can solve the problems of non-trivial system complexity, difficult practical implementation, high computational complexity, etc., and achieve the effects of improving the sensing quality, enhancing cognition, and enhancing the sensing capability of the receiver
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[0027]The cognitive radio sensing method employs wideband chirp signal frequency modulation for a digital signal, which is used in sensing the operable spectrum of the cognitive radio. The chirp signal is inherently wideband, as its bandwidth spread over a range of frequencies exceeds the signaling frequency of the cognitive radio. The chirp signal is generated by linear frequency modulation of a digital signal. Thus, the instantaneous frequency of the chirp signal increases or decreases linearly with time. As shown in FIG. 1A, the bandwidth of a chirp signal 100a extends from the starting frequency sweep f1 to the final frequency sweep f2. With a proper choice for processing gain, i.e., the FT product, where T is the bit period, is such that the spectrum of the chirp signal has a distinctive, nearly square shape 100b, as shown in FIG. 1B.
[0028]As shown in FIG. 2, the system architecture is a hybrid network 200, comprising a primary radio network 312a and a cognitive “adaptive” radi...
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